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authutils.go
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authutils.go
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// Copyright 2018 Project Harbor Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package token
import (
"crypto"
"crypto/rand"
"encoding/base64"
"encoding/json"
"fmt"
"strings"
"time"
"github.com/docker/distribution/registry/auth/token"
"github.com/docker/libtrust"
"github.com/goharbor/harbor/src/common/models"
"github.com/goharbor/harbor/src/common/security"
"github.com/goharbor/harbor/src/common/utils/log"
"github.com/goharbor/harbor/src/core/config"
"github.com/goharbor/harbor/src/core/promgr"
)
const (
issuer = "harbor-token-issuer"
)
var privateKey string
func init() {
privateKey = config.TokenPrivateKeyPath()
}
// GetResourceActions ...
func GetResourceActions(scopes []string) []*token.ResourceActions {
log.Debugf("scopes: %+v", scopes)
var res []*token.ResourceActions
for _, s := range scopes {
if s == "" {
continue
}
items := strings.Split(s, ":")
length := len(items)
typee := ""
name := ""
actions := []string{}
if length == 1 {
typee = items[0]
} else if length == 2 {
typee = items[0]
name = items[1]
} else {
typee = items[0]
name = strings.Join(items[1:length-1], ":")
if len(items[length-1]) > 0 {
actions = strings.Split(items[length-1], ",")
}
}
res = append(res, &token.ResourceActions{
Type: typee,
Name: name,
Actions: actions,
})
}
return res
}
// filterAccess iterate a list of resource actions and try to use the filter that matches the resource type to filter the actions.
func filterAccess(access []*token.ResourceActions, ctx security.Context,
pm promgr.ProjectManager, filters map[string]accessFilter) error {
var err error
for _, a := range access {
f, ok := filters[a.Type]
if !ok {
a.Actions = []string{}
log.Warningf("No filter found for access type: %s, skip filter, the access of resource '%s' will be set empty.", a.Type, a.Name)
continue
}
err = f.filter(ctx, pm, a)
log.Debugf("user: %s, access: %v", ctx.GetUsername(), a)
if err != nil {
return err
}
}
return nil
}
// MakeToken makes a valid jwt token based on parms.
func MakeToken(username, service string, access []*token.ResourceActions) (*models.Token, error) {
pk, err := libtrust.LoadKeyFile(privateKey)
if err != nil {
return nil, err
}
expiration, err := config.TokenExpiration()
if err != nil {
return nil, err
}
tk, expiresIn, issuedAt, err := makeTokenCore(issuer, username, service, expiration, access, pk)
if err != nil {
return nil, err
}
rs := fmt.Sprintf("%s.%s", tk.Raw, base64UrlEncode(tk.Signature))
return &models.Token{
Token: rs,
ExpiresIn: expiresIn,
IssuedAt: issuedAt.Format(time.RFC3339),
}, nil
}
func permToActions(p string) []string {
res := []string{}
if strings.Contains(p, "W") {
res = append(res, "push")
}
if strings.Contains(p, "M") {
res = append(res, "*")
}
if strings.Contains(p, "R") {
res = append(res, "pull")
}
return res
}
// make token core
func makeTokenCore(issuer, subject, audience string, expiration int,
access []*token.ResourceActions, signingKey libtrust.PrivateKey) (t *token.Token, expiresIn int, issuedAt *time.Time, err error) {
joseHeader := &token.Header{
Type: "JWT",
SigningAlg: "RS256",
KeyID: signingKey.KeyID(),
}
jwtID, err := randString(16)
if err != nil {
return nil, 0, nil, fmt.Errorf("Error to generate jwt id: %s", err)
}
now := time.Now().UTC()
issuedAt = &now
expiresIn = expiration * 60
claimSet := &token.ClaimSet{
Issuer: issuer,
Subject: subject,
Audience: audience,
Expiration: now.Add(time.Duration(expiration) * time.Minute).Unix(),
NotBefore: now.Unix(),
IssuedAt: now.Unix(),
JWTID: jwtID,
Access: access,
}
var joseHeaderBytes, claimSetBytes []byte
if joseHeaderBytes, err = json.Marshal(joseHeader); err != nil {
return nil, 0, nil, fmt.Errorf("unable to marshal jose header: %s", err)
}
if claimSetBytes, err = json.Marshal(claimSet); err != nil {
return nil, 0, nil, fmt.Errorf("unable to marshal claim set: %s", err)
}
encodedJoseHeader := base64UrlEncode(joseHeaderBytes)
encodedClaimSet := base64UrlEncode(claimSetBytes)
payload := fmt.Sprintf("%s.%s", encodedJoseHeader, encodedClaimSet)
var signatureBytes []byte
if signatureBytes, _, err = signingKey.Sign(strings.NewReader(payload), crypto.SHA256); err != nil {
return nil, 0, nil, fmt.Errorf("unable to sign jwt payload: %s", err)
}
signature := base64UrlEncode(signatureBytes)
tokenString := fmt.Sprintf("%s.%s", payload, signature)
t, err = token.NewToken(tokenString)
return
}
func randString(length int) (string, error) {
const alphanum = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
rb := make([]byte, length)
_, err := rand.Read(rb)
if err != nil {
return "", err
}
for i, b := range rb {
rb[i] = alphanum[int(b)%len(alphanum)]
}
return string(rb), nil
}
func base64UrlEncode(b []byte) string {
return strings.TrimRight(base64.URLEncoding.EncodeToString(b), "=")
}